var ImageFile;
function listenFileSelect() {
    // listen for file selection
    var fileInput = document.getElementById("mypicInput"); // pointer #1
    // When a change happens to the File Chooser Input
    fileInput.addEventListener('change', function (e) {
        ImageFile = e.target.files[0]; //Global variable
        var imageurl = URL.createObjectURL(ImageFile);
        console.log(imageurl);
        updateImage(imageurl);
    })
}
listenFileSelect();

function updateImage(imageurl) {
    const image = document.getElementById("mypic-goes-here"); // pointer #2
    image.src = imageurl; // Display this image
}

function savePost() {
    // Gather the data from the form
    var calorieData = document.getElementById('calorieInput').value;
    var details = document.getElementById('detailsText').value;
    var image = document.getElementById('mypicInput').files[0];

    const now = new Date();
    const dformatted = now.toLocaleString('en-US', {
        weekday: 'short', // "Monday", "Tuesday", etc.
        year: 'numeric', // "2021", "2022", etc.
        month: 'short', // "January", "February", etc.
        day: 'numeric', // 1, 2, 3, etc.
        hour: 'numeric', // 12 AM, 1 PM, etc.
        minute: 'numeric',
        second: 'numeric'
    });

    var formData = {
        date: dformatted, //save the date
        calories: calorieData, //save the calorie entered
        details: details,
        imageName: image.name // Store image name as a reference
    };//JS Object

    addToPostHistory(formData);
}

function addToPostHistory(data) {
    var user = JSON.parse(localStorage.getItem("loggedinUser"));
    if (user) {
        var users = JSON.parse(localStorage.getItem("users"));
        var email = user["email"]; //email of who is logged in
        const person = users.find(u => u.email === email);
        if (person.history === null) //if there are no users yet
            person.history = []; //initialize it to empty
        // pushes it to the "person" object
        person.history.push(data);

        localStorage.setItem("users", JSON.stringify(users));

        updateCount(data.calories);

        alert('Data saved successfully!');

    } else {
        console.log("No one is logged in");
    }
}

function updateCount(calories)
{
    var user = JSON.parse(localStorage.getItem("loggedinUser"));
    var users = JSON.parse(localStorage.getItem("users"));
    var email = user["email"]; //email of who is logged in

    const person = users.find(u => u.email === email);
    //count = count + calories
    person.count = Number(person.count) + Number(calories);

    //only 
    localStorage.setItem("users", JSON.stringify(users));

}